5 Umarex Notos 55 of 2026 For Flawless Cycling

Oct 11, 2026 7:36 AM

A backyard shooting bench sits littered with crushed lead skirts and an open breech block that refuses to budge. The side-lever stalls midway through its stroke because an ill-fitting rotary wheel pinched a mismatched skirt into the receiver wall, instantly locking the internal indexing gear. Clearing the jam means breaking out brass rods and risking scratched rifling, turning a quick afternoon target session into an exercise in pure frustration. One wrong accessory purchase easily causes recurrent magazine jams that chew up delicate mechanisms and sideline an otherwise capable PCP carbine.

Range time feels entirely different when every cycle is buttery smooth and pellets stack tightly in the bullseye. Reaching that seamless rhythm requires three straightforward choices: running factory-spec seven-shot magazines designed specifically for the platform, feeding consistent .22 caliber pellets with clean skirts, and mounting direct-fit sights that clamp firmly onto the barrel shroud without drifting under vibration. When the feed path matches the bore dimensions down to the fraction of a millimeter, the rifle cycles cleanly, retains air efficiency, and delivers pinpoint accuracy every time you cock the lever. The options below match your 5.5mm carbine with precision gear built for reliable feeding and tight groupings.

Umarex High-Grade CO2 Cartridges for Pellet Guns, BB Guns and

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9.4
Brand
Umarex

Key specs2

Package Contents

12 individual 12g CO2 capsules

Power Source Compatibility

Engineered strictly for standard 12-gram CO2 airguns. This cartridge does not supply high-pressure air for PCP air rifles like the Notos.

Pros & cons32

Pros

Standard 12-gram size fits compatible CO2-powered pellet, BB, and airsoft guns
Convenient 12-pack count provides multiple air cylinder reloads for target plinking
Compact capsule profile allows simple storage in range bags and shooting kits

Cons

Incompatible with high-pressure air systems like the Umarex Notos PCP carbine
CO2 output fluctuates with rapid firing and cooler ambient temperatures

RWS Meisterdugeln .22 Caliber 14.0 G Airgun Pellets

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9.4
Brand
Umarex

Key specs2

Caliber and Sizing

.22 caliber (5.5mm) / 14.0 grains

Intended Shooting Application

Match-grade wadcutter pellets cut clean holes in paper targets, making them well suited for precision practice in .22 caliber rifles.

Pros & cons42

Pros

Exact .22 caliber (5.5mm) diameter matches factory Notos barrel bore specifications
Standard 14.0-grain weight promotes consistent flight profiles for target precision
Listed match-grade accuracy supports tight target groupings on paper targets
Generous 250-count tin supplies ample ammunition for multiple shooting sessions

Cons

Flat wadcutter nose profile produces more aerodynamic drag at longer shooting distances
Lead pellet composition requires careful hand hygiene after loading magazines

Umarex High-Grade CO2 Cartridges for Pellet Guns, BB Guns and

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9.4
Brand
Umarex

Key specs2

Cartridge Capacity

88 grams per capsule (2-pack)

Power Source Compatibility

Built exclusively for 88-gram CO2 air rifles. High-pressure air systems like the PCP Notos cannot accept threaded CO2 canisters.

Pros & cons32

Pros

High-capacity 88-gram volume delivers extended shot strings on compatible CO2 rifles
Clean gas formulation prevents valve contamination in compatible CO2 airguns
Dual-capsule pack offers a backup cylinder ready for extended plinking sessions

Cons

Incompatible with PCP airgun reservoirs such as the Umarex Notos PCP carbine
Purchase is restricted in certain zip codes due to shipping regulations

Umarex Notos 7-Shot Rotary Magazine, Fits the Notos Carbine .22

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8.8
Brand
Umarex

Key specs2

Magazine Capacity

7-shot rotary indexing clip

Rifle Compatibility

Engineered specifically for the Umarex Notos .22 caliber PCP carbine, ensuring proper alignment with the breech and probe.

Pros & cons32

Pros

Factory-engineered specifically for the Umarex Notos .22 caliber PCP carbine
7-shot rotary capacity enables quick follow-up shots without manual single loading
True factory indexing minimizes feeding jams compared to generic third-party magazines

Cons

Limited to 7 rounds per magazine, requiring multiple spares for long range sessions
Designed strictly for .22 caliber (5.5mm) Notos carbines and will not chamber other calibers

Umarex Notos Fiber Optic Adjustable Open Sight Set – Front

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6.4
Brand
Umarex

Key specs2

Platform Fit

Umarex Notos Gen 2 (models 2254852 and 2254871)

Sighting System

Includes front and rear sights with bright fiber optic inserts and adjustable rear elevation and windage controls.

Pros & cons42

Pros

Direct factory fit for Umarex Notos Gen 2 PCP air rifles (item numbers 2254852 and 2254871)
Rear sight features windage and elevation adjustments to zero the point of impact
High-visibility fiber optic inserts provide a bright, distinct sight picture in varied light
Complete package contains both front and rear open sights for immediate installation

Cons

Does not offer optical magnification for long-distance target acquisition
Compatibility is restricted to Notos Gen 2 models and may not mount to other barrel shrouds

Last update on 2026-10-11 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

What does the 55 designation indicate on the Umarex Notos carbine?

The 55 marking specifies 5.5mm bore sizing, which is the metric equivalent of standard .22 caliber airgun barrels. Choosing 5.5mm ammunition, such as RWS Meisterkugeln 14.0-grain pellets (part number 2317375), ensures proper rifling contact and prevents cycling snags. Always verify that your pellet tins state .22 caliber or 5.5mm to avoid loose fits or jammed loading ports.

Does the 7-shot rotary magazine fit the .22 caliber Notos PCP?

Yes, the Umarex Notos 7-shot rotary magazine is engineered specifically to fit the Notos carbine .22 caliber PCP air rifle. Using this dedicated factory cylinder prevents indexing misalignment and feed jams that often happen with third-party alternatives. Keeping spare factory magazines ready lets you reload smoothly during extended shooting strings without damaging the internal cycling components.

What grain weight pellet feeds smoothly through the Notos 5.5mm action?

A 14.0-grain pellet in .22 caliber, such as the RWS Meisterkugeln 5.5mm wadcutter, seats cleanly in the rotary wheel and feeds reliably into the chamber. Matching this exact caliber and profile prevents skirt deformation during bolt seating. If you consider other projectile designs for your tactical air rifle setup, check the overall pellet length to ensure it does not bind against the magazine faceplate.

Can you mount open fiber optic sights directly to the Notos Gen 2?

Yes, the Umarex Notos fiber optic adjustable open sight set (part number 2254851) is designed specifically for the Notos Gen 2 PCP carbine. It mounts directly to factory item numbers 2254852 and 2254871 without requiring aftermarket adapters. This gives you a clear, contrasting front and rear sight picture right out of the box.

How do you adjust the factory fiber optic rear sight for point of impact?

The Notos Gen 2 factory rear sight includes adjustments for both windage and elevation to fine-tune your point of impact. You can dial horizontal and vertical corrections directly on the sight housing to align your target hold. Regulating both axes allows you to zero your sights cleanly to match your preferred .22 caliber pellet profile.

Can the Umarex Notos run on 12-gram or 88-gram CO2 cartridges?

No, the Umarex Notos operates entirely on pre-charged pneumatic air and does not accept disposable CO2 capsules. While Umarex produces clean 12-gram and 88-gram cartridges for a CO2 BB gun or replica pistol, the Notos requires a dedicated high-pressure air fill. Using CO2 canisters is not compatible with the Notos fill valve and will not power the platform.

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